Login Flow Custom Commands

Custom Commands for login-flow

Overview

The login-flow CLI supports user-authored custom commands that are compiled into the binary alongside the auto-generated API commands. Custom commands get a fully-wired SDK client that inherits the CLI's auth, retries, TLS, base URL, and global headers — zero configuration required.

Architecture

cli/login-flow/custom.rs    ← Your command handlers (protected by .fernignore)
cli/login-flow/sdk.rs       ← Generated bridge: client() + block_on()
cli/login-flow/main.rs      ← Generated entrypoint (calls custom::register)
login-flow-sdk/             ← Co-generated typed SDK crate
login-flow-types/           ← Co-generated typed model crate

Adding a Custom Command

1. Edit cli/login-flow/custom.rs

This file is protected by .fernignore — fern generate will never overwrite it. Register commands in the register() function:

use login_flow_sdk::api::*;

pub fn register(app: CliApp) -> CliApp {
    let app = app.command(
        clap::Command::new("get")
            .about("Get a widget")
            .arg(clap::Arg::new("widgetId").required(true))
        ,
        |matches, ctx| {
            let widget_id = matches.get_one::<String>("widgetId").unwrap();
            let client = super::sdk::client(ctx);
            let result = super::sdk::block_on(
                client.widgets.get(widget_id),
            )?;
            println!("{}", serde_json::to_string_pretty(&result).unwrap());
            Ok(())
        },
    );
    app
}

Then build and test:

cargo build
login-flow get <widgetId>

2. Available SDK Clients

The super::sdk::client(ctx) call returns a login_flow_sdk::api::Client with the following sub-clients:

3. Key Patterns

Get the SDK client (execution-sharing, fully authenticated):

let client = super::sdk::client(ctx);

Run an async SDK call from a sync handler:

let result = super::sdk::block_on(
    client.some_resource.some_method(args),
)?;

Use typed models for request/response serialization:

use login_flow_sdk::api::*;

4. Authentication

Custom commands automatically inherit the CLI's authentication. The following auth schemes are configured:

• OAuth2 (oauth-authorization-code): env ``

No manual auth wiring is needed in custom command handlers.

Regeneration Safety

After running fern generate, your custom.rs is preserved. All generated code (SDK, types, glue, main.rs) is updated to match the latest API spec. If the SDK surface changes (renamed methods, new sub-clients), update your custom.rs to match.

Build & Test

# Build the CLI (includes custom commands)
cargo build

# Run your custom command
login-flow <your-command> [args]

# Run with verbose output for debugging
RUST_LOG=debug login-flow <your-command> [args]